Ibnul Jawzi said, Abul Wafaa Ibn Aqeel Al-Faqee said, our Shaikh Abul Fadl Al-Hamdaani said, ‘’The innovators (in) Islam and the fabricators of Hadeeth are worse than the Mulhiddoon [i.e. the heretics 1], for the heretics aim to corrupt Islam from the outside, whilst these (people) want to corrupt it from within. They (i.e. the innovators and the fabricators of hadeeth) are similar to the people of a country who try to corrupt its state of affairs and the heretics are similar to those who lay a siege from the outside; so the ones from within (i.e. the innovators and fabricators of hadeeth) open the fortress. Therefore, they are more harmful to Islam than those who do not (attribute) themselves to it outwardly.[2]

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[1] Ilhaad:

Complete Il-haad is to turn away from Islaam completely and that is Major Il-haad, which exits a person from the fold of Islaam, such as the Il-haad of the communists, the idol worshippers and those similar to them.